The New York City mayor, who has already ruled out an independent presidential bid of his own, told ABC's "Good Morning America" today that there's no chance of victory for anyone else running outside the two-party system. George Stephanopoulos blogs:

I’ve spoken to political pros who say 2012 is the year an Independent could run and win the White House. Bloomberg – who already said he wouldn’t enter the race – doesn’t agree.

“No, the deck is stacked for one of the two major Party candidates will be elected,” he said. “And there can always be a third party candidate. But in the end if you take a look at what happened in the last election, and when people talk about third party candidates and say ‘Well they don’t have a chance so I got to go and pick the lesser of two evils of the major parties’” ...

[H]eading into this election an overwhelming number of Americans – 84% - say they are angry or dissatisfied with Washington, per a New York Times/ CBS News poll. Everyone is looking to blame someone else, Bloomberg said, and he has no sympathy for it.

“In downturns everybody is angry. And we’re in a society today where we have to blame somebody, but the blame is all of us…Elect somebody else if you don’t like the government,” he said.

With public disdain for both parties high and Congress's popularity at a historic low, this would seem to be an ideal moment for a deep-pocketed political outsider to make a third-party run for the White House. If Bloomberg is right and it can't be done in 2012, then maybe it can't be done at all.